December 1938
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DECEMBER 1938 VOLUME 11 NUMBER 10 GALPINS ELECTRICAL STORESi: 75 LEE HIGH ROAD, LEWISHAM, LONDON, S.E.13 TERMS: Cash with order or C.O.D. charges extra. Phone :LEE GREEN 5240 ALL GOODS SENT ON 3 DAYS APPROVAL AGAINST CASH. LARGE POWER TRANSFORMERSMORTLEY SPRAGUE HAND - LARGE SLIDER RESISTANCES I.> hostcr and other good maker*,DRIVEN GENERATORS, two sepa- worm and wheel control, 2,500 ohms, allin goodconditionandfully rate outputs, :410v.at 30 in A, also 200 n\, price. 15/, guaranteed 21)0:230 volts 1ph. 311 cy. r v. at 2'/ amps, brand new in cases, input, useful for Spot Welding, etc.30/-;afesu secondhand guaranteed outputs ': to 5 volts at 200 300 amps, Perfect at 25/-. STEEL CABINETS,40x24x16, make VI kw, 50/-.Ditto 3 to 7./v.at good transmitting racks, 12/6 each, 300 watts, 25/-. .Another 2íN1'38í)v. X-RAY TUBES. 7 inch dia., tung- input 3.3 ant S volts kcv. out, 90/-. sten targets, 12/6 each, packing free; Another 2181'110y.input, 3 volts 3 Had nom targets, 17/6 each. DIMMER RESISTANCES, wound kw. out, 90/-,Another 220;380 v. in tvith Eureka wire, 500watts,15/-: e, I'; kw. out, 85/-. EX-G.P.O. PEDESTAL TELEPHONES 13 and 32 volts 1,000 w, 20/-; 1,31111te,25/-; 2,00) w, Another 200 210 v. input, a 1,000 and complete with microphone, hand ear- 32/6;3,000watts,42/6. Allfully 2,1100 v. 2 kw. out, 85/--Ditto, inputphone and automatic dial,0 to9, 11 v. 100 watts out, 15/-.Ditto, 10 v. price 6/-, P.F.; Small wall -type ditto guaranteed. 150 w. out, 17/6.Ditto, 5 to 20 voltswithmicrophonetransformerand 1', kw, 50/-.Ditto, 2 to 6v.7.30 bell, can be used for battery work-ZENITH WIRE -WOUND VITREOUS watts, 25/-.Ditto, 4 to 30 v. 250 w, ing, 7/6 P.F.; wall hell -boxes with RESISTANCES, 2,500 ohm, 250m.\, 20/-. Ditto,220 volts 1 kw, 32/6.transformertosuitthe pedestal 1/6. Ditto, 170 mA, 1/1255 ohm, Ditto, 90 to 120 volts, 6 kw, £6 10s. phones, 3/-, P.P. S00 in.',, 1/6 each.750 ohm, 170 mA, Ditto, 0 to 33 v. 1'i kw, 55/-.Ditto, 5,010 ohm, 170 mA, 1/6 to 2'¿ volts 2 kw, 75/-.Ditto, 1 toE X-G.P.O. AUTOMATIC DIALS for 1/6 each. 30 v. 2'; kw, 90/-.Another 200/250 v. selector station tuning, numbered 0 c: ah, Pos13d.on sae,. input, output from 10 to 200 volts in to 9 andcompletewithselector tenvolttappings,3';'kw, 1/6 hand combin- STANDARD TELEPHONE MAINS Another 200/210 volts in 4,000 v.130 ation phones with finger switch, 4/6; CONDENSERS, 1,1,1, 100 volts work- mA out, 25/-.Ditto, a 1,000, 1,500 and Western Electric microphones, 2/6: ing, 4,1.each, 4for1/-. 2mF, 000 2,000 v.200 watts out, 27/6. Ditto, microphone transformers, high ratio,volts working, 1/- each, 3 for 2/6. 4v.100 amps out,25/-. Another 1 /6. Post 3d,Philips 1 mF 4,000 v. work- with23tappings from 10volts to ing, 4/. each.Muirhead, 1 mF 2,000 20/-each. E X -NAVAL TUNING INDUCT- 50voltsat 400 watts, volt, working, 1/6 each. Post 3.1. Another with 8 tappings from 300 to ANCE in ease, range 3 to 3,1881 metres. 1,600volts,200 watts,30/-. Ditto, 10 350 volts 2.50 m.\, 12/6..\uto Wound STANDARD TELEPHONE 20hy, Voltage Changer Transformers, LARGE SWITCHARM and 22 studs, 100 m/A MAINS CHOKES 3/- each. mounted on ebonite,size10in.x 100/120 volts to 200 '210 volts or vice- I .I Zenith 11 ont, 2 amp Resist- versa, 100 watts, 10/-; 130 watts 12/6; 4 in.,price 2/6. ance; with variable band, 2/6 each. 250watts,17/6;1,000watts,35/-; 1,500 watts, 42/6; 2,000watts,52/6. SULLIVAN TRANSMITTING CON- Also a few only, 1,500 watt Cores for DENSERS variable,capacity.0005, PHILIPS 10 -WATT PRE -STAGE rewindingPrimary, OK Sec.not large size ideal for short-wave work, AMPLIFIERS, single stage low 7/6 each. known, 17/6 each..All Transformers intped input,highoutputwith sent carriage forward. EX-R.A.F. ROTARY CONVERTERS, calves505 and AC 084 for 200/250 v WESTON EVERETT-EDGCUMBE,DC to I)C 12 volts input, 500 volts 100 \C mains, 30/- each. etc. MOVING COIL MILLIAM-mA output, 20/-: ditto, 750 volts out- METERS.fall fully guaranteed). 0 to put, 25/-.A few of each that need slight repair to brush holder,etc.,WIRE WOUND RESISTANCES. 3 mA and 0 to 50 mA, 2', in. dial, onstoutUtica,7 ins.by1'; ins., 15/- each; 0 to 500 mA, 2'4 in., 12/6; windings O.K ,10/- each. Post 1 '-. 0 to 5 mA, 2 in. dial, 14/-; 0 to 25 mA, 4,000 ohms, 200 mA, new,space and 50 mA, 2 in., 12/6 each. Thermo ELECTRIC LIGHT CHECK wound, price 1/6each. Ammeters, E. Turner, 0tofi amp, METERS, 200/250 v 1 ph 50 cycles, 5 and 10 amp, 6/-, post 1 /-. Ex-R.A.F. 10/- each.Moving Coil Meter Move- CHOKE COILS, wound with 2lbs. ments for Recalibrating into Multi - Visual Wavemeters, 350 to 2,500 range Meters, approx. 6 to 10 mA,metres 5/..Silvertown highly sensi- 30 gauge DCCwireongelatine full scale deflection, 2', in. dial, 6/ -tive Galvanometers, 6/- each. Ex- Stalloystampings,complete with each; 4 in. dial, 6/6 each,Post &l. G.I'.O.Glass TopRelays,approx. brackets, price 4/6.P.I'. working currentltnA,6/6 each. Westinghouse Rectifiers, 500 volts 250 EPOCH CINEMA MODEL MOVING SHILLING SLOT ELECTRIC COIL SPEAKERS, 6voltfield,15 mA, in voltage doubler circuit, 20/ - ohm. Speech coil handle 20 watts, each.Sullivan Mica Condensers, .002 CHECK METERS 200'250 volts,50 35/- each, or without cone but with mF 7,500 v.Will separate into 5x01 cy., 1 ph., carry load of 5 to 10 amps, frame, 20/-.C.Forward. mEs, 2/each. 15/- each. P.F. Déceneber 1938 1 SHORT WAVE RECEIVERS AND TRANSMITTERS FROM YOUR RADIO DEALER ; W. H. SMITH &SON, orin difficulty send 1/2 to STRATTON & Co., Ltd., Eddystone Works, Bromsgrove Street, Birmingham. London Service :Webb's Radio, 14, Soho Street, W.1. The Short -Wave Magazine MULLARD TRANSMITTING VALVES Transmitting valves to meet every requirement can be selected from theMullardrangecomprising SHORT-WAVE TRIODES SCREENED R.F. PENTODES MODULATOR TRIODES MERCURY VAPOUR RECTIFIERS MERCURY VAPOUR Ask for a copy o` the latest list of low RECTIFIER for and medium power transmitting valves 1,500 volts to 15 mA TRANSMITTING co. DIVISION Mullard Wireless ServiceLTD. i 225 TOTTENHAM COURT ROAD, W.I. DENCO Ultra Low Loss Components employing Trolitul insulation Specified for " THE TWO -BAND TWO " Plug-in Type Transmitting Coils 7 Mc C.T. 6/6 14 Mc C.T. ... 6/- "E WODEN TRANSFORMERS 28 Mc C.T. ... 5¡ - THE L EST THAT MONEY CAN BUY ! Short -Wave Chokes,2 -each Woden transformers are indi- viduallybuiltand testedby PRICES r..r.0.1... transformer experts using only 2.5 v. at 10 amp...14/ - the very best materials. 6.3 v. at 3.5 amp ...12/6 Their heavy cast shields and 7.5 v. at 3 amp ..12/6 TROLITUL-the idealu.h.f.insulator, white porcelain insulatorsare 500-0-500 at 150 mils26/6 unique features only to be found 100 watt Auto -Trans 16/ - better than ceramic and yet aseasily on Woden instruments. They LOOK better Swinging Choke 5/25 worked as ebonite-available for home -they ARE better. Hys at 150 mils18/6 Note :All Woden Transformers Smoothing Choke 20 constructional purposes. andChokesarestockedby Hys at 60 mils 12/6 Webb's Radio of London and Smoothing Choke 20 Birmingham. Hys at 150 mils 18/6 Send kd. stamp for Lists. For accuracy, dependability and service you can't beat Woden. WODEN TRANSFORMER CO. 234 BURRS RD., CLACTON. Tel. 770 ST. JOHNS SQ., WOLVERHAMPTON. Tele. 22829. December 1938 ór CRITICAL Testing- the The HIGH RESISTANCE Av0MIN0R AVOMINOR ELECTRICAL MEASURING INSTRUMENT Electrical Testing Instrument An extremely sensitive 10 range D.C. moving -coilmicro - ammeter alsocalibrated as a multi -range voltmeter and megohmmeter. Itssix voltage ranges areallat 20,000 ohms per volt, the consumptionat fullscale deflectionbeing50 microamps.This extreme sen- In ease,with sitivity permits precision h i g It voltage readings with negligible loading BRITISH MADE Leads, inter- and is eminently suitablefor changeabletest measuring grid, screen and anode prods and croco- voltages, and also for television. AIL "Avo" Instru- dileclips: and On the lower of its two current instruction ranges, adeflectionof approx. ments may be pur- booklet. 1 mm. is produced by a current chased on Deferred ofone microamp, allowing ac- Terms. £3:10s. curate readings of grid current, etc. The Universal AVOMINOR Electrical Measuring Instrument Write for fully descriptive pamphlets Complete.riih I e a d s, inter- Sole Proprietors and Manufacturers A precision meter for measuring A.C. and I changeable tcst- THE AUTOMATIC COIL WINDER & ELECTRICAL D.C. volts, D.C. milliamps, and ohms.It has I ing prods and EQUIPMENT CO., LTD. Winder House,DouglasStreet, 22 ranges. An accurate moving -coil movement crocodile eli s: gives a 3 -in.full scaledeflection.Total I and instruction London, S.W.1. Telephone :Victoria 3404á. resistance is 200.000 ohms. booklet. The word "Avo" is our Registered Trade Mark. £5 :1 Os. Indispensable for efficient Short -Wave Listening Why not give a pair as a Christmas Present to your Short -Wave Fan Friends ! Short-wave stations are tricky things .